In a large bowl combine catsup, vinegar, brown sugar, curry powder, Worcestershire sauce, hickory-flavored salt, pepper, and garlic. Cover; let stand at room temperature 30 minutes or refrigerate for up to 3 days.
In a grill with a cover arrange hot coals around a drip pan. Test for medium heat above the pan. Place ribs, fat side up, on grill rack over drip pan but not over coals. Cover and grill for 1-1/2 to 2 hours or until meat is very tender, basting generously with sauce the last 15 minutes of cooking. Makes 8 servings.